ES51930 10kHz LCR analog front Features Description • 6000 counts ADC resolution The ES51930 is the analog frond end chip suitable for LCR bridge meter with simple DMM function. By using ES51930 to implement the LCR bridge meter, the complicated PCB design is not necessary. The ES51930 is built-in resistor switches network to provide different ranges control. It also provides a high performance integrated circuit by the test signal with different frequency to measure the complex impedance of the device. The ES51930 includes a flexible serial interface to external MCU. The MCU could get the real part and imaginary part of complex impedance from ES51930 directly and • LQFP-80L package • Dual power supply needed • High performance analog front end for impedance (Z) measurement (Taiwan patent no.: 456205) • Support Z/DCR measurement for LCR mode • Built-in simple DMM front end circuit to support DCV/Freq./Diode/NCV mode • Four different test frequency are available: 100/120/1k/10k Hz for Z measurement • Test signal level: 0.5VRMS / 0.1VRMS typ. • 6 ratio resistor range used for LCR mode • Test range: L: 600.0 µH ~ 200.0 H C: 600.0 pF ~ 10.00 mF calculate the D/Q/R/θ parameter with L or C values easily. The ES51930 also supports simple DMM function includes DC voltage, frequency counter, diode forward voltage and not-contact electric field measurement. R: 60.00 Ω ~ 20.00 MΩ • Low battery voltage detector • Support buzzer sound driver with driving pattern & frequency selectable • Min. source resistance: 120Ω typical Application Handheld LCR / DMM meter Ver 2.1 1 14/10/23 ES51930 LCR/DMM analog front 1. Functional description 1.1 Overview The ES51930 is an analog front end IC built-in multiple measurement modes for LCR/DMM application. The LCR mode could measure complex impedance (Inductance/Capacitance/Resistance) with secondary parameters including dissipation factor (D), quality factor (Q), phase angle (θ), equivalent series or parallel resistance (ESR or Rp). The DMM mode could measure DC voltage, frequency counter, diode forward voltage and non-contact ac electric filed (NCV). The ES51930 also provides a flexible serial interface for external microprocessor operation. The external microprocessor could implement a fully auto range LCR/DMM product by proper firmware design with ES51930. 1.2 Basic impedance theory The general DMM could measure DC resistance only, but the LCR meter could measure DC resistance and AC impedance. The impedance consists of resistance (real part) and reactance (imaginary part). For example, Zs represents the impedance in series mode. Zs can be defined a combination of resistance Rs and reactance Xs. It also could be defined as a |Z| of magnitude with a phase angle θ. Imaginary axis (series mode) Zs = Rs + jXs Xs | Zs | θ>0 θ θ1 Rs1 Rs Real axis θ1 < 0 Xs1 Ver 2.1 Zs1 = Rs1 + jXs1 2 14/10/23 ES51930 LCR/DMM analog front Zs = Rs + jXs or |Zs|∠θ |Z| = Rs 2 + Xs 2 Rs = |Zs| cosθ Xs = |Zs| sinθ Xs/Rs = tanθ θ = tan-1(Xs/Rs) If θ > 0, the reactance is inductive. In other words, if θ < 0, the reactance is capacitive. There are two types for reactance. The one is the inductive reactance XL and the other is the capacitive reactance XC. They could be defined as: (f = test signal frequency) XL = 2πf L (L = Inductance) XC = 1 (C = Capacitance) 2π f C 1.5 Measurement mode The impedance could be measured in series or parallel mode. The impedance Z in parallel mode could be represented as reciprocal of admittance Y. The admittance could be defined as Y = G + jB. The G is the conductance and the B is the susceptance. Admittance in parallel mode Impedance in serial mode Rs Rp jXs jXp Z = Rs + jXs Y = 1/Z = 1/Rp + 1/jXp = G + jB Rs: Resistance in series mode Rp: Resistance in parallel mode Xs: Reactance in series mode Xp: Reactance in parallel mode Cs: Capacitance in series mode Cp: Capacitance in parallel mode Ls: Inductance in series mode Lp: Inductance in parallel mode There are two factors to provide the ratio of real part and imaginary part. Usually the quality factor Q is used for inductance measurement and the dissipation factor D is used for capacitance measurement. D factor is defined as a reciprocal of Q factor. Q = 1 / D = tanθ Q = Xs / Rs = 2πf Ls / Rs = 1 / 2πf Cs Rs Ver 2.1 3 14/10/23 ES51930 LCR/DMM analog front Q = B / G = Rp / | Xp | = Rp / 2πf Lp = 2πf Cp Rp Actually, Rs and Rp are existed in the equivalent circuit of capacitor or inductor. If the capacitor is small, Rp is more important than Rs. If capacitor is large, the Rs is also more important. Therefore, use parallel mode to measure lower value capacitor and use series mode to measure higher value capacitor. For inductor, the impedance relationship is different from capacitor. If the inductor is small, Rp is almost no effect. If inductor is large, the Rs is also no effect. Therefore, use series mode to measure lower value inductor and use parallel mode to measure higher value inductor. 1.3 Scale range configuration Function mode Inductance Ls/Lp Capacitance Cs/Cp Resistance Rs/Rp DC resistance Function mode DCV Frequency Ver 2.1 Frequency 100/120Hz 1kHz 10kHz 100/120Hz 1kHz 10kHz 100/120Hz 1kHz 10kHz N/A LCR mode Meas. Range 60.00mH~200.0H 6000uH~60.00H 600.0uH~6.000H 60.00nF~10.00mF 6.000nF~600.0uF 600.0pF~60.00uF 60.00Ω~20.00MΩ 60.00Ω~20.00MΩ 60.00Ω~20.00MΩ 600.0Ω~40.00MΩ DMM mode Meas. Range 600.0mV~20.00V 6.000kHz~15.00MHz 4 Min. resolution 0.01mH 1uH 0.1uH 0.01nF 1pF 0.1pF 0.01Ω 0.01Ω 0.01Ω 0.1Ω Min. resolution 0.1mV 1Hz 14/10/23 ES51930 LCR/DMM analog front 1.4 Accuracy (Ae) vs. Impedance (ZDUT) @ Ta =18 ~ 28 ℃ Freq. / Z DCR 100/120Hz 1kHz 10kHz 0.1- 1Ω 1.5%+5d 1.5%+5d 1.5%+5d 1.5%+5d 1 – 10Ω 0.7%+3d 0.7%+3d 0.7%+3d 0.7%+3d 10 – 100kΩ 0.4%+2d 0.4%+2d 0.4%+2d 0.4%+2d 100k – 1MΩ 0.7%+3d 0.7%+3d 0.7%+3d 0.7%+3d (0.5VRMS only) 1M – 20ΜΩ 1.5%+3d 1.5%+3d 1.5%+3d 3.0%+3d Remark D < 0.1 Note: All accuracy is guaranteed by proper ratio resistor calibration and open/short calibration. All accuracy is guaranteed for 10cm distance from VDUTH/VDUTL pins of ES51930. If test signal amplitude is selected for 0.1VRMS, the accuracy should increased by 50%. 1+ D2 If D > 0.1, the accuracy should be multiplied by ZC = 1/2πf C ZL = 2πf L if D << 0.1 in capacitance mode if D << 0.1 in inductance mode Ae = impedance (Z) accuracy Definition: Q = 1 D Rp = ESR (or Rs) × (1+ 1 D2 ) 1. D value accuracy De = + Ae × (1+D) 2. ESR accuracy Re= + ZM × Ae (Ω) ie., ZM = impedance calculated by 1 3. 2πfC or 2πf L Phase angle θ accuracy θe= + (180/π) × Ae (deg) 4-terminals measurement with guard shielding The DUT test leads are implemented by four terminals measurement. For achieve the accuracy shown above, it is necessary to do open/short calibration process before measurement. The test leads for DUT should be as short as possible. If longer extended cable or probe is used, the guard shielding is necessary. Ver 2.1 5 14/10/23

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